Display device

ABSTRACT

A display device is disclosed. The display device includes a display panel configured to be wound around or unwound from a roller installed in a housing, wherein the housing is configured to provide a receiving space for the display panel, a module cover coupled to a rear of the display panel, wherein the module cover is configured to be wound around or unwound from the roller with the display panel, an extension sheet extending from a lower side of the display panel, wherein the extension sheet is configured to be wound from the roller, and at least one shock-absorbing member positioned next to a lower end of the module cover, wherein the at least one shock-absorbing member is disposed at a rear surface of the extension sheet.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of U.S. patent application Ser. No.17/135,737, filed on Dec. 28, 2020, which claims the benefit of anearlier filing date and right of priority to International ApplicationNo. PCT/KR2019/018638 filed on Dec. 27, 2019, the contents of which arehereby incorporated by reference herein in its entirety.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present disclosure relates to a display device.

2. Description of the Related Art

As the information society has developed, the demand for display deviceis increasing in various forms, and accordingly, in recent years,various display devices such as a liquid crystal display (LCD), plasmadisplay panel (PDP), electroluminescent display (ELD), vacuumfluorescent display (VFD), and the like have been studied and used.

Thereamong, a display device using an organic light emitting diode(OLED) has excellent luminance and viewing angle characteristics incomparison with a liquid crystal display device and does not require abacklight unit, thereby being implemented in an ultrathin type.

In addition, a flexible display panel can be bent or wound around aroller. The flexible display panel may be used to implement a displaydevice that unfolds on a roller or winds around the roller. Many studieshave been made on a structure for winding a flexible display panelaround a roller or unwinding the flexible display panel from the roller.

SUMMARY OF THE INVENTION

It is an object of the present disclosure to solve the above and otherproblems.

It is another object of the present disclosure to prevent damage to adisplay panel generated when the display panel is wound around a roller.

It is a further object of the present disclosure to eliminate vibrationand noise generated when the display panel is wound around the roller.

In accordance with the present disclosure, the above and other objectscan be accomplished by the provision of a display device including adisplay panel configured to be wound around or unwound from a rollerinstalled in a housing, wherein the housing is configured to provide areceiving space for the display panel, a module cover coupled to a rearof the display panel, wherein the module cover is configured to be woundaround or unwound from the roller with the display panel, an extensionsheet extending from a lower side of the display panel, wherein theextension sheet is configured to be wound from the roller, and at leastone shock-absorbing member positioned next to a lower end of the modulecover, wherein the at least one shock-absorbing member is disposed at arear surface of the extension sheet.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and other advantages of thepresent disclosure will be more clearly understood from the followingdetailed description taken in conjunction with the accompanyingdrawings, in which:

FIGS. 1 to 68 are views showing examples of a display device accordingto embodiments of the present disclosure.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Description will now be given in detail according to exemplaryembodiments disclosed herein, with reference to the accompanyingdrawings. For the sake of brief description with reference to thedrawings, the same or equivalent components may be denoted by the samereference numbers, and description thereof will not be repeated.

In general, suffixes such as “module” and “unit” may be used to refer toelements or components. Use of such suffixes herein is merely intendedto facilitate description of the specification, and the suffixes do nothave any special meaning or function.

In the present disclosure, that which is well known to one of ordinaryskill in the relevant art has generally been omitted for the sake ofbrevity. The accompanying drawings are used to assist in easyunderstanding of various technical features and it should be understoodthat the embodiments presented herein are not limited by theaccompanying drawings. As such, the present disclosure should beconstrued to extend to any alterations, equivalents and substitutes inaddition to those which are particularly set out in the accompanyingdrawings.

It will be understood that although the terms first, second, etc. may beused herein to describe various elements, these elements should not belimited by these terms. These terms are only used to distinguish oneelement from another. It will be understood that when an element isreferred to as being “connected with” another element, there may beintervening elements present. In contrast, it will be understood thatwhen an element is referred to as being “directly connected with”another element, there are no intervening elements present.

A singular representation may include a plural representation unlesscontext clearly indicates otherwise.

In the following description, even if an embodiment is described withreference to a specific figure, if necessary, reference numeral notshown in the specific figure may be referred to, and reference numeralnot shown in the specific figure is used when the reference numeral isshown in the other figures.

Referring to FIG. 1, a display device 100 may include a display unit 20and a housing 30. The housing 30 may have an internal space. At least aportion of the display unit 20 may be located inside the housing 30. Atleast a portion of the display unit 20 may be located outside thehousing 30. The display unit 20 may display a screen.

The direction parallel to the longitudinal direction of the housing 30may be referred to as a first direction DR1, +x axis direction, −x axisdirection, a left direction, or a right direction. The direction inwhich the display unit 20 displays a screen may be referred to as +zaxis, a forward direction, or the front. The direction opposite to thedirection in which the display unit 20 displays the screen may bereferred to as −z axis, a rearward direction, or the rear. A thirddirection DR3 may be parallel to +z axis direction or −z axis direction.The direction parallel to the height direction of the display device 100may be referred to as a second direction DR2, +y axis direction, the −yaxis direction, an upper direction, or a lower direction.

The third direction DR3 may be a direction perpendicular to the firstdirection DR1 and/or the second direction DR2. The first direction DR1and the second direction DR2 may be collectively referred to as ahorizontal direction. In addition, the third direction DR3 may bereferred to as a vertical direction. A left and right direction LR maybe parallel to the first direction DR1, and an up and down direction UDmay be parallel to the second direction DR2.

Referring to FIG. 2, the display unit 20 may be entirely located insidethe housing 30. At least a portion of the display unit 20 may be locatedoutside the housing 30. The degree to which the display unit 20 isexposed to the outside of the housing 30 may be adjusted as necessary.

Referring to FIG. 3, the display unit 20 may include a display panel 10and a plate 15. The display panel 10 may be flexible. For example, thedisplay panel 10 may be an organic light emitting display (OLED).

The display panel 10 may have a front surface for displaying an image.The display panel 10 may have a rear surface facing the front surface.The front surface of the display panel 10 may be covered with a lighttransmissive material. For example, the light transmissive material maybe a synthetic resin or film.

The plate 15 may be coupled, fastened or attached to the rear surface ofthe display panel 10. The plate 15 may include a metal material. Theplate 15 may be referred to as a module cover 15, a cover 15, a displaypanel cover 15, a panel cover 15, or an apron 15.

Referring to FIG. 4, the plate 15 may include a plurality of segments 15c. A magnet 64 may be located inside a recess 118 of the segment 15 c.The recess 118 may be located on a surface of the segment 15 c facingthe display panel 10. The recess 118 may be located in the front surfaceof each segment 15 c. Since the magnet 64 is accommodated inside therecess 118, the magnet 64 may not protrude from the segment 15 c. Thedisplay panel 10 may be flat without being wrinkled even when it is incontact with the segment 15 c.

Referring to FIG. 5, a plurality of magnets 64 may be located on a link73. For example, at least one magnet 64 may be located on a first arm 73a and at least one magnet 64 may be located on a second arm 73 b. Theplurality of magnets 64 may be spaced apart from each other.

Referring to FIG. 6, one magnet 64 may be located on the first arm 73 aand the second arm 73 b, respectively. The magnet 64 may have a shapeextended in the long side direction of the first arm 73 a and the secondarm 73 b. Since the magnet 64 has a shape extended in the long sidedirection of the first arm 73 a and the second arm 73 b, the area of theportion where the link 73 is in close contact with the display panel andthe module cover may be increased. Accordingly, the adhesion between thelink 73 and the display panel and the module cover may be strengthened.

Referring to FIG. 7, the magnet 64 may be located in a depression 321formed in the link 73. The depression 321 may have a shape recessedinward of the link 73. The magnet 64 may be coupled to the link 73through at least one screw 187.

The width LHW in which the depression 321 is recessed inwardly of thelink 73 may be equal to or greater than the thickness MGW of the magnet64. If the thickness MGW of the magnet 64 is greater than the width LHWof the depression 321, the display panel 10 and the module cover 15 maynot be in close contact with the link 73. In this case, the displaypanel 10 may be wrinkled or may not be flat.

A panel protector 97 may be located in the rear surface of the displaypanel 10. The panel protector 97 may prevent the display panel 10 frombeing damaged due to friction with the module cover 15. The panelprotector 97 may include a metal material. The panel protector 97 mayhave a very thin thickness. For example, the panel protector 97 may havea thickness of about 0.1 mm.

Since the panel protector 97 contains a metal material, magneticattraction between the panel protector 97 and the magnet 64 may occur.Accordingly, the module cover 15 located between the panel protector 97and the link 73 may be in close contact with the magnet 64 even if itdoes not contain a metal material.

Referring to FIG. 8, the module cover 15 may be in close contact withthe link 73 by an upper bar 75 of the upper side and a guide bar 234 ofthe lower side (see FIG. 15). A portion between the upper bar 75 and theguide bar 234 of the link 73 may not be in close contact with the modulecover 15. Alternatively, the central portion of the link 73 may not bein close contact with the module cover 15. The central portion of thelink 73 may be near an arm joint 152. In this case, the distance APRD1,APLD2 between the module cover 15 and the link 73 may not be constant.In this case, the display panel 10 may be bent or twisted.

Referring to FIG. 9, when the magnet 64 is located in the depression 321of the link 73, the magnet 64 attracts the panel protector 97, so thatthe module cover 15 can also be in close contact with the magnet at thesame time. That is, the central portion of the link 73 may be in closecontact with the module cover 15.

Referring to FIG. 10, a bead 136 may be formed in the upper surface ofthe segment 15 b. The bead 136 may have a shape recessed inwardly ofsegment 15 b. The bead 136 may have a shape recessed in the −y axisdirection. For example, the bead 136 may be formed by pressing thesegment 15 b. A plurality of beads 136 may be formed on the segment 15b. The plurality of beads 136 may be spaced apart from each other. Thebead 136 may enhance the rigidity of segment 15 b. The bead 136 canprevent the shape of the segment 15 b from being deformed due to anexternal impact.

Referring to FIG. 11, a source PCB 120 may be located above the modulecover 15. In the case of roll-up or roll-down, the position of thesource PCB 120 may be changed with the movement of the module cover 15.A FFC cable 231 may be located in the central portion of the modulecover 15 based on the first direction. The FFC cable 231 may be locatedin both ends of the module cover 15 based on the first direction.

Referring to FIG. 12, the segment 15 d may include a depression 425recessed in the −z axis direction. The depression 425 may form a spacebetween the display panel 10 and the module cover 15. The FFC cable 231may be accommodated in a space formed by the depression 425. Inaddition, the depression 425 may improve the rigidity of the segment 15d.

The bead 136 may be located on the segment 15 d excluding a portionwhere the depression 425 is located. The bead 136 may not be located inthe portion where the depression 425 is located because the thickness ofthe segment 15 d in the third direction becomes thinner.

Referring to FIG. 13, a penetrating portion 437 may be located in thecentral portion of the segment 15 e based on the first direction. Thepenetrating portion 437 may penetrate the central portion of the segment15 e in the second direction. That is, the penetrating portion 437 maybe a hole located in the segment 15 e. The penetrating portion 437 maybe a portion where the FFC cable 231 is located. Since the penetratingportion 437 is formed in the segment 15 e, the thickness of the segment15 e may be reduced in comparison with the case where the FFC cable 231is located in the depression 425.

The bead 136 may be located on the segment 15 e excluding a portionwhere the penetrating portion 437 is located. In the portion where thepenetrating portion 437 is located, the bead 136 may not be locatedbecause the thickness of the segment 15 e in the third direction becomesthinner.

Referring to FIG. 14, a top case 167 may cover the source PCB 120 andthe upper bar 75 as well as the display panel 10 and the module cover15. One surface of the upper bar 75 may be coupled to the rear surfaceof the module cover 15, and the other surface thereof may be coupled tothe source PCB 120. The upper bar 75 may be fixed to the module cover 15to support the source PCB 120.

The lower end of the FFC cable 231 may be connected to a timingcontroller board 105 (see FIG. 15) inside a panel roller 143 (see FIG.15). The FFC cable 231 may be wound around or unwound from the panelroller 143 together with the display unit 20.

A portion of the FFC cable 231 may be located between the display panel10 and the module cover 15. A portion of the FFC cable 231 locatedbetween the display panel 10 and the module cover 15 may be referred toas a first portion 231 a. The first portion 231 a may be located in thedepression 425 formed by the plurality of segments 15 d. Alternatively,the first portion 231 a may be accommodated in the depression 425 formedby the plurality of segments 15 d.

A portion of the FFC cable 231 may penetrate the segment 15 f. A portionof the FFC cable 231 that passes through the segment 15 f may bereferred to as a second portion 231 b. The segment 15 f may include afirst hole 521 a formed in the front surface and a second hole 521 bformed in the rear surface. The first hole 521 a and the second hole 521b may be connected to each other to form a single hole 521. The hole 521may penetrate the segment 15 f in the third direction. The secondportion 231 b may penetrate the hole 521. The hole 521 may be referredto as a connection hole 521.

The upper end of the FFC cable 231 may be electrically connected to thesource PCB 120. A part of the FFC cable 231 may be located in the rearsurface of the module cover 15. A portion of the FFC cable 231 locatedin the rear surface of the module cover 15 may be referred to as a thirdportion 231 c. The third portion 231 c may be electrically connected tothe source PCB 120.

The third portion 231 c may be covered by the top case 167. Accordingly,the third portion 231 c may not be exposed to the outside.

Referring to FIG. 15, the FFC cable 231 may be connected to the timingcontroller board 105 mounted in the panel roller 143. A penetrating hole615 may be formed on the panel roller 143, and the FFC cable 231 may beconnected to the timing controller board 105 through the penetratinghole 615.

The penetrating hole 615 may be located in one side of the panel roller143 and may penetrate an outer circumferential portion of the panelroller 143. The FFC cable 231 may be connected to one side of the timingcontroller board 105 through the penetrating hole 615.

Even when the FFC cable 231 is located in the outer circumference of thepanel roller 143, it may maintain the connection with the timingcontroller board 105 due to the penetrating hole 615. Accordingly, theFFC cable 231 may rotate together with the panel roller 143 to preventtwisting.

A part of the FFC cable 231 may be wound around the panel roller 143. Aportion of the FFC cable 231 wound around the panel roller 143 may bereferred to as a fourth portion 231 d. The fourth portion 231 d may bein contact with the outer circumferential surface of the panel roller143.

A part of the FFC cable 231 may pass through the penetrating hole 615. Aportion of the FFC cable 231 passing through the penetrating hole 615may be referred to as a fifth portion 231 e.

The lower end of the FFC cable 231 may be electrically connected to thetiming controller board 105. A part of the FFC cable 231 may be locatedinside the panel roller 143. A portion of the FFC cable 231 locatedinside the panel roller 143 may be referred to as a sixth portion 231 f.The sixth portion 231 f may be electrically connected to the timingcontroller board 105.

Referring to FIG. 16, the lower end of the display panel 10 may beconnected to the roller 143. The display panel 10 may be wound around orunwound from the roller 143. The front surface of the display panel 10may be coupled to the plurality of source PCBs 120. The plurality ofsource PCBs 120 may be spaced apart from each other.

A source chip on film (COF) 123 may connect the display panel 10 and thesource PCB 120. The source COF 123 may be located in the front surfaceof the display panel 10. The roller 143 may include a first part 331 anda second part 337. The first part 331 and the second part 337 may befastened by a screw. The timing controller board 105 may be mounted inthe roller 143.

The source PCB 120 may be electrically connected to the timingcontroller board 105. The timing controller board 105 may send digitalvideo data and the timing control signal to the source PCB 120.

The cable 117 may electrically connect the source PCB 120 and the timingcontroller board 105. For example, the cable 117 may be a flexible flatcable (FFC). The cable 117 may penetrate the hole 331 a. The hole 331 amay be formed in a seating portion 379 or the first part 331. The cable117 may be located between the display panel 10 and the second part 337.

The seating portion 379 may be formed in an outer circumference of thefirst part 331. The seating portion 379 may be formed by stepping aportion of the outer circumference of the first part 331. The seatingportion 379 may form a space B. When the display unit 20 is wound aroundthe roller 143, the source PCB 120 may be accommodated in the seatingportion 379. Since the source PCB 120 is accommodated in the seatingportion 379, the source PCB 120 may not be twisted or bent, anddurability may be improved.

The cable 117 may electrically connect the timing controller board 105and the source PCB 120.

Referring to FIG. 17, the roller 143 wound around with the display unit20 may be installed in a first base 31. The first base 31 may be abottom surface of the housing 30. The roller 143 may be extended alongthe longitudinal direction of the housing 30. The first base 31 may beconnected to the side surface 30 a of the housing 30.

Referring to FIGS. 18 and 19, the beam 31 a may be formed in the firstbase 31. The beam 31 a may improve the bending or torsional rigidity ofthe first base 31. Many components may be installed in the first base31, and the first base 31 can receive a large load. Since the rigidityof the first base 31 is improved, sagging due to the load can beprevented. For example, the beam 31 a may be formed by a pressingprocess.

The second base 32 may be spaced upward from the first base 31. Thespace S1 may be formed in the first base 31 and the second base 32. Theroller 143 wound around with the display unit 20 may be accommodated inthe space S1. The roller 143 may be located between the first base 31and the second base 32.

The second base 32 may be connected to the side surface 30 a of thehousing 30. The bracket 33 may be fastened to the upper surface of thefirst base 31. The bracket 33 may be fastened to the side surface 30 aof the housing 30.

The beam 32 a may be formed in the second base 32. The beam 32 a mayimprove the bending or torsional rigidity of the second base 32. Forexample, the beam 32 a may be formed by a press process.

A third part 32 d may be connected to the first part 32 b and the secondpart 32 c. A fourth part 32 e may be connected to the first part 32 band the second part 32 c. A space S2 may be formed between the thirdpart 32 d and the fourth part 32 e. Accordingly, bending or torsionalrigidity of the second base 32 may be improved. The third part 32 d maybe referred to as a reinforcing rib 32 d or a rib 32 d. The fourth part32 e may be referred to as a reinforcing rib 32 e or a rib 32 e.

Many components can be installed in the second base 32 and the secondbase 32 can receive a large load. As the rigidity of the second base 32is improved, sagging due to the load can be prevented.

A first reinforcing plate 34 may be located between the first base 31and the second base 32. The first reinforcing plate 34 and the secondbase 32 may be fastened by a screw. The first reinforcing plate 34 maysupport the second base 32. The first reinforcing plate 34 may preventsagging of the second base 32. The first reinforcing plate 34 may belocated in the central portion of the first base 31 or in the centralportion of the second base 32. The first reinforcing plate 34 mayinclude a curved portion 34 a. The curved portion 34 a may be formedalong the roller 143. The curved portion 34 a may not be in contact withthe roller 143 or the display unit 20 wound around the roller 143. Thecurved portion 34 a may maintain a certain distance from the roller 143so as not to interfere with the rotation of the roller 143.

A second reinforcing plate 35 may be fastened to the first base 31 andthe first reinforcing plate 34. The second reinforcing plate 35 maysupport the first reinforcing plate 34. The second reinforcing plate 35may be located behind the first reinforcing plate 34. The secondreinforcing plate 35 may be located behind the first base 31. The secondreinforcing plate 35 may be located perpendicular to the first base 31.The second reinforcing plate 35 may be fastened to the beam 31 a of thefirst base 31. The second base 32 may face the front surface or rearsurface of the housing 30.

Referring to FIG. 20, the second base 32 f may not form a space. Whenthe load that the second base 32 f receives is not large, the secondbase 32 f may have sufficient rigidity by including the beam 32 g. Thefirst base 31′ may include a beam 31 a′.

Referring to FIGS. 21 and 22, a motor assembly 810 may be installed inthe second base 32. Drive shaft of the motor assembly 810 may be formedin both sides. The right driving shaft and the left driving shaft of themotor assembly 810 may rotate in the same direction. Alternatively, theright driving shaft and the left driving shaft of the motor assembly 810may rotate in opposite directions.

The motor assembly 810 may include a plurality of motors. The pluralityof motors may be connected in series with each other. The motor assembly810 may output a high torque by connecting a plurality of motors inseries.

A lead screw 840 may be located in the left side and the right side ofthe motor assembly 810, respectively. The motor assembly 810 may beconnected to the lead screw 840. A coupling 811 may connect the leadscrew 840 and the drive shaft of the motor assembly 810.

The lead screw 840 may be threaded along the longitudinal direction. Thedirection of the threads formed in the right lead screw 840 and thedirection of the threads formed in the left lead screw 840 may beopposite to each other. The direction of the threads formed in the rightlead screw 840 and the direction of the threads formed in the left leadscrew 840 may be the same. The pitches of the left lead screw 840 andthe right lead screw 840 may be the same.

The bearing 830 a, 830 b may be installed in the second base 32. Thebearing 830 a, 830 b may support both sides of the lead screw 840. Thebearing 830 a, 830 b may include an inner bearing 830 b located close tothe motor assembly 810 and an outer bearing 830 a located far from themotor assembly 810. The lead screw 840 may be stably rotated by thebearing 830 a, 830 b.

The slide 820 may be engaged with the lead screw 840. The slide 820 maymove forward or rearward in the longitudinal direction of the lead screw840 according to the rotation of the lead screw 840. The slide 820 maymove between the outer bearing 830 a and the inner bearing 830 b. Theslide 820 may be located in the left lead screw 840 and the right leadscrew 840, respectively. The left slide 820 may be engaged with the leftlead screw 840. The right slide 820 may be engaged with the right leadscrew 840.

The left slide 820 and the right slide 820 may be located symmetricallywith respect to the motor assembly 810. Due to the driving of the motorassembly 810, the left slide 820 and the right slide 820 may move faraway or approach from each other by the same distance.

Referring to FIG. 23, the motor assembly 810 may include a plate 813.The plate 813 may be referred to as a mount plate 813 or a motor mountplate 813. A coupling portion 32 h may be formed in an upper surface ofsecond base 32. The plate 813 may be fastened to the coupling portion 32h through a screw S. The motor assembly 810 may be spaced apart from thetop surface of the second base 32. A washer 813 may be located betweenthe top surface of the plate 813 and the screw S. The washer 813 mayinclude a rubber material. The washer 813 may reduce vibration generatedin the motor assembly 810. The washer 813 may improve driving stabilityof the display device 100.

Referring to FIG. 24, a guide rail 860 may be installed in the secondbase 32. The guide rail 860 may be located in parallel with the leadscrew 840. The slide 820 may be engaged with the guide rail 860. A firststopper 861 b may be located in one side of the guide rail 860, and asecond stopper 861 a may be located in the other side of the guide rail860. The range in which the slide 820 can move may be limited to betweenthe first stopper 861 b and the second stopper 861 a.

A spring 850 may wrap the lead screw 840. The lead screw 840 maypenetrate the spring 850. The spring 850 may be located between theinner bearing 830 b and the slide 820. One side of the spring 850 maycontact the inner bearing 830 b, and the other side of the spring 850may contact the slide 820. The spring 850 may provide an elastic forceto the slide 820.

When the slide 820 is caught in the first stopper 861 b, the spring 850may be maximally compressed. When the slide 820 is caught in the firststopper 861 b, the length of the spring 850 may be minimized. When theslide 820 is caught in the first stopper 861 b, the distance between theslide 820 and the inner bearing 830 b may be minimized.

Referring to FIG. 25, when the slide 820 is caught in the second stopper861 a, the spring 850 may be maximally tensioned. When the slide 820 iscaught in the second stopper 861 b, the length of the spring 850 may bemaximized. When the slide 820 is caught in the second stopper 861 a, thedistance between the slide 820 and the inner bearing 830 b may bemaximized.

Referring to FIG. 26, the first part 820 a may be engaged with the guiderail 860. The first part 820 a may move along the guide rail 860.Movement of the first part 820 a in the longitudinal direction of theguide rail 860 may be restricted. The second part 820 b may be locatedabove the first part 820 a. The first part 820 a and the second part 820b may be fastened through a screw. The second part 820 b may be spacedapart from the guide rail 860. The lead screw 840 may penetrate thesecond part 820 b. For example, the second part 820 b may include a malethread that engages with a female thread of the lead screw 840.Accordingly, even if the lead screw 840 is rotated, the slide 820 can bestably moved forward or rearward along the guide rail 860 withoutrotating.

The third part 820 c may be coupled to one side of the second part 820b. The third part 820 c may contact the spring 850. The third part 820 cmay be provided with an elastic force from the spring 850.

Referring to FIGS. 27 and 28, a link mount 920 may be installed in thesecond base 32. One side of a second arm 912 may be pivotably connectedto a link mount 920. The other side of the second arm 912 may bepivotably connected to a joint 913. The other side of the second arm 912may be pivotably connected to a second axis 913 b. One side of a rod 870may be pivotably connected to the slide 820. The other side of the rod870 may be pivotably connected to the second arm 912 or a third arm 915.One side of the third arm 915 may be pivotably connected to the linkmount 920. The other side of the third arm 915 may be pivotablyconnected to the other side of the rod 870. The link mount 920 mayinclude a shaft 921. The second arm 912 or the third arm 915 may bepivotably connected to the shaft 921.

A link bracket 951 may be referred to as a link cap 951. The linkbracket 951 may be coupled to a top case 950. The top case 950 may bereferred to as a case top 950, an upper bar 950, a top 950, or a bar950. The top case 950 may be located in an upper end of the display unit20. The display unit 20 may be fixed to the top case 950.

One side of a first arm 911 may be pivotably connected to the joint 913.One side of the first arm 911 may be pivotably connected to a firstshaft 913 a. The other side of the first arm 911 may be pivotablyconnected to the link bracket 951 or the top case 950.

A gear g1 may be formed in one side of the first arm 911. A gear g2 maybe formed in the other side of the second arm 912. The gear g1 of thefirst arm 911 and the gear g2 of the second arm 912 may be engaged witheach other.

When the slide 820 approaches the outer bearing 830 a, the second arm912 or the third arm 915 may stand up. At this time, the direction inwhich the second arm 912 or the third arm 915 stands may be referred toas a standing direction DRS.

The second arm 912 may include a protrusion 914 protruding in thestanding direction DRS. The protrusion 914 may be referred to as aconnection part 914. The third arm 915 may include a protrusion 916protruding in the standing direction DRS. The protrusion 916 may bereferred to as a connection part 916. The protrusion 914 of the secondarm 912 and the protrusion 916 of the third arm 915 may face or contacteach other. The other side of the rod 870 may be fastened to theprotrusion 914 of the second arm 912 or the protrusion 916 of the thirdarm 915.

A link 910 may include a first arm 911, a second arm 912, a third arm915, and/or a joint 913.

Referring to FIGS. 29 and 30, an angle formed by the second arm 912 orthe third arm 915 with respect to the second base 32 may be referred toas theta S. When the rod 870 is connected to the upper side of thesecond part 820 b, an angle between the rod 870 and the second base 32may be referred to as theta A, and the minimum force for the rod 870 tostand the second arm 912 or the third arm 915 may be referred to as Fa.When the rod 870 is connected to the middle of the second part 820 b, anangle between the rod 870 and the second base 32 may be referred to astheta B, and the minimum force for the rod 870 to stand the second arm912 or the third arm 915 may be referred to as Fb. When the rod 870 isconnected to the lower side of the second part 820 b, an angle betweenthe rod 870 and the second base 32 may be referred to as theta C, andthe minimum force for the rod 870 to stand the second arm 912 or thethird arm 915 may be referred to as Fc.

A relationship of theta A<theta B<theta C can be established for thesame theta S. In addition, a relationship of Fc<Fb<Fa may be establishedfor the same theta S. If an angle formed by the second arm 912 or thethird arm 915 with respect to the second base 32 is the same, the forcerequired to stand up the second arm 912 or the third arm 915 can becomesmaller as the angle formed by the rod 870 and the second base 32increases. The rod 870 may be connected to the lower side of the secondpart 820 b to reduce the load applied on the motor assembly 810.

Referring to FIG. 31, the rod 870′ may not be connected to theprotrusion of the second arm 912′ or the protrusion of the third arm915′. When the angle formed by the second arm 912′ or the third arm 915′with respect to the second base 32 is theta S, the angle formed by therod 870′ and the second base 32 is referred to as theta 1, and theminimum force for the rod 870′ to stand up the second arm 912′ or thethird arm 915′ may be referred to as F1.

Referring to FIG. 32, the rod 870 may be connected to the protrusion 914of the second arm 912 or the protrusion 916 of the third arm 915. Whenthe angle formed by the second arm 912 or the third arm 915 with respectto the second base 32 is theta S, the angle formed by the rod 870 andthe second base 32 may be referred to as theta 2, and the minimum forcefor the rod 870 to stand the second arm 912 or the third arm 915 may bereferred to as F2.

Referring to FIG. 33, when theta S is the same, theta 2 may be greaterthan theta 1. If Theta S is the same, F1 can be greater than F2. If theangle formed by the second arm 912, 912′ and the second base 32 is thesame, the force required to stand up the second arm 912, 912′ may becomesmaller as the angle formed by the rod 870, 870′ and the second base 32becomes larger. The rod 870 may be connected to the protrusion 914, 916to stand up the second arm 912 with less force than a case where the rod870′ is not connected to the protrusion. The rod 870 may be connected tothe 914, 916 to reduce the load applied on the motor assembly 810.

Referring to FIG. 34, the second arm 912 or the third arm 915 may have acentral axis CR. When the rod 870 is fastened to the second arm 912 by adistance r away from the central axis CR, the angle formed by the rod870 and the second base 32 may be referred to as theta 2, and theminimum force for the 870 to stand the second arm 912 or the third arm915 may be referred to as F3. When the rod 870 is fastened to the secondarm 912 by a distance r′ away from the central axis CR, the angle formedby the rod 870 and the second base 32 may be referred to as theta 2′,and the minimum force for the rod 870 to stand the second arm 912 or thethird arm 915 may be referred to as F4. When the rod 870 is fastened tothe second arm 912 by a distance r″ away from the central axis CR, theangle formed by the rod 870 and the second base 32 may be referred to astheta 2″, and the minimum force for the rod 870 to stand the second arm912 or the third arm 915 may be referred to as F5.

Referring to FIG. 35, when theta S is the same, theta 2″ may be greaterthan theta 2′, and theta 2′ may be greater than theta 2. When theta S isthe same, F3 may be greater than F4, and F4 may be greater than F5. Asthe rod 870 is fastened away from the central axis CR, the forcerequired to stand the second arm 912 may be smaller. Since the rod 870is fastened away from the central axis CR, the load on the motorassembly 810 may be reduced.

Referring to FIG. 36, the first arm 911 and the second arm 912 may be incontact with or close to the rear surface of the display unit 20. Sincethe first arm 911 and the second arm 912 are in contact with or close tothe rear surface of the display unit 20, the display unit 20 may bestably wound around or unwound from a roller. The link mount 920 mayinclude a first part 922 and a second part 923. The first part 922 andthe second part 923 may face each other. A space S4 may be formedbetween the first part 922 and the second part 923. The first part 922may face the display unit 20. The first part 922 may be located closerto the display unit 20 than the second part 923. The second arm 912 maybe pivotably connected to the front surface of the first part 922. Apart of the third arm 915 may be accommodated in the space S4 andpivotably connected to the first part 922 or the second part 923.

Referring to FIG. 37, the rod 870 may include a first part 871 and asecond part 872. The first part 871 may include a connection part 871 ain one side thereof. The second part 872 of the slide 820 may form aspace S5 therein. The connection part 871 a may be inserted into thespace S5. The connection part 871 a may be pivotably connected to thesecond part 820 b (see FIG. 36) of the slide 820. The other side of thefirst part 871 may be connected to one side of the second part 872. Theother side of the second part 872 may be pivotably connected to thesecond arm 912 or the third arm 915. The first part 871 may form a spaceS3 therein. The first part 871 may include a hole 871 b. The lead screw840 may be accommodated in the hole 871 b or the space S3.

The distance between the second part 872 and the display unit 20 may beD1. The second arm 912 may have a thickness W1. A portion of the thirdarm 915 accommodated in the space S4 may have a thickness W3. Thethickness W3 may be equal to the distance between the first part 922 andthe second part 923. A portion of the third arm 915 that is notaccommodated in the space S4 may have a thickness W2. The first part 922may have a thickness W4. The thickness W2 may be greater than thethickness W3. The thickness W2 may be equal to the sum of the thicknessW3 and the thickness W4. D1 may be the sum of the thickness W1 and thethickness W2.

The second arm 912 may be located in contact with or close to the rearsurface of the display unit 20, and the third arm 915 may be locatedbetween the second arm 912 and the second part 872. The second part 872can stably transmit power for standing the second arm 912 due to thethird arm 915. The second part 872 may be connected to the first part871 by moving forward with respect to the axis of rotation of the leadscrew 840, so as to stably stand the second arm 912 or the third arm915. Thus, the play between the second arm 912 and the second part 872may be minimized.

Referring to FIG. 38, a pusher 930 may be installed in the link mount920. The pusher 930 may be referred to as a lifter 930. A second part932 may be fastened to the first part 931. The second part 932 may be incontact with or separated from the link bracket 951. The second part 932may be made of a material having high elasticity. The first part 931 maybe made of a material having a lower elasticity than the second part932. The first part 931 may be made of a material having a higherrigidity than the second part 932. The first part 931 and the secondpart 932 may be collectively referred to as a head 936. The head 936 maybe located above the link mount 920.

A third part 933 may be connected to the first part 931. Alternatively,the third part 933 may be extended downward from the first part 931. Thethird part 933 may be referred to as a tail 933. A fourth part 934 mayprotrude from the third part 933. The link mount 920 may form a spaceS6, and the third part 933 may be accommodated in the space S6. Thespace S6 may be opened upward. The space S6 in which the third part 933is accommodated may be adjacent to the space S4 (see FIG. 37) in whichthe third arm 915 is accommodated. The second part 932 of the link mount920 may include a hole 924. The hole 924 may be a long hole formed inthe vertical direction. The length of the hole 924 may be H1. The fourthpart 934 may be inserted into the hole 924. The spring 935 may beaccommodated in the space S6. The spring 935 may be located below thethird part 933. The spring 935 may provide an elastic force in thedirection perpendicular to the third part 933.

The head 936 may be greater than the diameter of the space S6. When thehead 936 is caught in the upper end of the space S6, the height of thehead 936 from the second base 32 may be minimized. The minimum height ofthe head 936 may be referred to as H2. When the height of the head 936is minimized, the fourth part 934 may be caught in the lower end of thespace S6. When the height of the head 936 is minimized, the spring 935may be maximally compressed. When the height of the head 936 isminimized, the elastic force provided by the spring 935 may bemaximized. When the height of the head 936 is minimized, the height ofthe top case 950 may be maximized.

The pusher 930 may provide elastic force to the link bracket 951, whilebeing in contact with the link bracket 951. Thus, the load applied onthe motor assembly 810 to stand up the link 910 may be reduced.

Referring to FIG. 39, when the link 910 stands up sufficiently, thepusher 930 may be separated from the link bracket 951. When the pusher930 is separated from the link bracket 951, the height of the head 936from the second base 32 may be maximized. The maximum height of the head936 may be referred to as H3. When the height of the head 936 ismaximized, the fourth part 934 may be caught in the upper end of thehole 924 (see FIG. 38). If the height of the head 936 is maximized, thespring 935 may be maximally tensioned. When the height of the head 936is maximized, the elastic force provided by the spring 935 may beminimized. The maximum height H3 of the head 936 may be substantiallyequal to the sum of the minimum height H2 of the head 936 and the lengthH1 of the hole.

Referring to FIG. 40, the display unit 20 may be in a state of beingmaximally wound around the roller 143. The display device 100 may besymmetrical with respect to the motor assembly 810. The height of thetop case 950 may be minimized. The slide 820 may be in a positionclosest to the inner bearing 830 b. The slide 820 may be in a state ofbeing caught in the first stopper 861 b. The spring 850 may be in amaximally compressed state. The pusher 930 may be in contact with thelink bracket 951. The height of the pusher 930 may be minimized.

Referring to FIG. 41, about half of the display unit 20 may be in astate of being wound around the roller 143. The display device 100 maybe symmetrical with respect to the motor assembly 810. About half of thedisplay unit 20 may be in a state of being unwound from the roller 143.The slide 820 may be located between the first stopper 861 b and thesecond stopper 861 a. The pusher 930 may be separated from the linkbracket 951. The height of the pusher 930 may be maximized.

Referring to FIG. 42, the display unit 20 may be in a state of beingmaximally unwound from the roller 143. The display device 100 may besymmetrical with respect to the motor assembly 810. The height of thetop case 950 may be maximized. The slide 820 may be in a positionclosest to the outer bearing 830 a. The slide 820 may be in a state ofbeing caught in the second stopper 861 a. The spring 850 may be in astate of maximum tension. The pusher 930 may be separated from the linkbracket 951. The height of the pusher 930 may be maximized.

Referring to FIGS. 43 to 46, a link mount 920 a, 920 b may be installedin the base 31. The link mount 920 a, 920 b may include a right linkmount 920 a spaced to the right from a first right bearing 830 a and aleft link mount 920 b spaced to the left from a second left bearing 830d.

A link 910 a, 910 b may be connected to the link mount 920 a, 920 b. Thelink 910 a, 910 b may include a right link 910 a connected to the rightlink mount 920 a and a left link 910 b connected to the left link mount920 b.

The right link 910 a may be referred to as a first link. The left link910 b may be referred to as a second link. The right link mount 920 amay be referred to as a first link mount 920 a. The left link mount 920b may be referred to as a second link mount 920 b.

The link 910 a, 910 b may include a first arm 911 a, 911 b, a second arm912 a, 912 b, and an arm joint 913 a, 913 b. One side of the second arm912 a, 912 b may be rotatably connected to the link mount 920 a, 920 b.The other side of the second arm 912 a, 912 b may be rotatably connectedto the arm joint 913 a, 913 b. One side of the first arm 911 a, 911 bmay be rotatably connected to the arm joint 913 a, 913 b. The other sideof the first arm 911 a, 911 b may be rotatably connected to the linkbracket 951 a, 951 b.

The link bracket 951 a, 951 b may include a right link bracket 951 aconnected to the first arm 911 a of the right link 910 a and a left linkbracket 951 b connected to the first arm 911 b of the left link 910 b.The link bracket 951 a, 951 b may be connected to the upper bar 950

The upper bar 950 may connect the right link bracket 951 a and the leftlink bracket 951 b.

A rod 870 a, 870 b may connect a slider 860 a, 860 b to the link 910 a,910 b. One side of the rod 870 a, 870 b may be rotatably connected tothe slider 860 a, 860 b. The other side of the rod 870 a, 870 b may berotatably connected to the second arm 912 a, 912 b. The rod 870 a, 870 bmay include a right rod 870 a connecting the right slider 860 a and thesecond arm 912 a of the right link 910 a and a left rod 870 b connectingthe left slider 860 b and the second arm 912 b of the left link 910 b.The right rod 870 a may be referred to as a first rod 870 a. The leftrod 870 b may be referred to as a second rod 870 b.

Specifically, a structure formed by a right lead screw 840 a, the rightslider 860 a, the right rod 870 a, and the right link 910 a will bedescribed. The right slider 860 a may include a body 861 a and a rodmount 862 a. The body 861 a may have a thread SS formed on an innercircumferential surface thereof. The thread formed in the body 861 a maybe engaged with the thread RS of the right lead screw 840 a. The rightlead screw 840 a may penetrate the body 861 a.

The rod mount 862 a may be formed in the right side of the body 861 a.The rod mount 862 a may be rotatably connected to one side of the rightrod 870 a. The rod mount 862 a may include a first rod mount 862 a 1 anda second rod mount 862 a 2. The first rod mount 862 a 1 may be disposedin front of the right lead screw 840 a. The second rod mount 862 a 2 maybe disposed behind the right lead screw 840 a. The first rod mount 862 a1 and the second rod mount 862 a 2 may be spaced apart from each other.The second rod mount 862 a 2 may be spaced apart from the first rodmount 862 a 1 in the −z axis direction. The right lead screw 840 a maybe located between the first rod mount 862 a 1 and the second rod mount862 a 2.

The rod mount 862 a may be rotatably connected to one side of the rod870 a through a connecting member C1. The connecting member C1 maypenetrate the rod mount 862 a and the right rod 870 a.

The right rod 870 a may be rotatably connected to a second arm 912 athrough a connecting member C2. The connecting member C2 may penetratethe second arm 912 a and the right rod 870 a.

The right rod 870 a may include a transmission part 871 a connected tothe second arm 912 a of the right link 910 a and a cover 872 a connectedto the rod mount 862 a of the right slider 860 a. The transmission part871 a may transmit a force, which is generated as the right slider 860 amoves forward or rearward along the right lead screw 840 a, to the rightlink 910 a.

The cover 872 a may include a first plate 873 a disposed in front of theright lead screw 840 a. The first plate 873 a may be disposedperpendicular to the base 31. Alternatively, the first plate 873 a mayface the right lead screw 840 a.

The cover 872 a may include a second plate 874 a disposed behind theright lead screw 840 a. The second plate 874 a may be disposedperpendicular to the base 31. Alternatively, the second plate 874 a mayface the right lead screw 840 a. Alternatively, the second plate 874 amay be spaced apart from the first plate 873 a. The right lead screw 840a may be located between the first plate 873 a and the second plate 874a.

The cover 872 a may include a third plate 875 a connecting the firstplate 873 a and the second plate 874 a. The third plate 875 a may beconnected to the transmission part. The third plate 875 a may be locatedabove the right lead screw 840 a.

The cover 872 a may include a fourth plate 876 a connecting the firstplate 873 a and the second plate 874 a. The fourth plate 876 a may beconnected to the third plate 875 a. The fourth plate 876 a may belocated above the right lead screw 840 a.

One side of the first plate 873 a may be connected to the first rodmount 862 a 1. The first plate 873 a and the first rod mount 862 a 1 maybe connected through the connecting member C1′. The other side of thefirst plate 873 a may be connected to the third plate 875 a.

One side of the second plate 874 a may be connected to the second rodmount 862 a 2. The second plate 874 a and the second rod mount 862 a 2may be connected through the connecting member C1. The other side of thesecond plate 874 a may be connected to the third plate 875 a.

When the right slider 860 a is moved closer to the motor assembly 810,the right lead screw 840 a and the right rod 870 a may be in contactwith each other. When the right lead screw 840 a and the right rod 870 acontact each other, mutual interference may occur and the movement ofthe right slider 860 a may be restricted.

The cover 872 a may provide a space S1 therein. The first plate 873 a,the second plate 874 a, the third plate 875 a, and the fourth plate 876a may form the space S1. When the right slider 860 a is moved closer tothe motor assembly 810, the right lead screw 840 a may be accommodatedor escaped into the space S1 provided by the cover 872 a. The rightslider 860 a may move closer to the motor assembly 810 than a case ofnot having the cover 872 a, due to the space S1 provided by the cover872 a. That is, the cover 872 a may expand the movable range of theright slider 860 a by providing the space S1 therein. In addition, sincethe right lead screw 840 a is accommodated in the cover 872 a, the sizeof the housing 30 (see FIG. 2) can be reduced.

In addition, the cover 872 a may limit the minimum value of the angletheta S formed between the second arm 912 a and the base 31. The thirdplate 875 a of the cover 872 a may contact the second arm 912 a and maysupport the second arm 912 a, when theta S is sufficiently small. Bysupporting the second arm 912 a, the third plate 875 a may limit theminimum value of theta S and prevent sagging of the second arm 912 a.That is, the cover 872 a may serve as a stopper for preventing saggingof the second arm 912 a. In addition, the third plate 875 a may reducethe initial load for standing the second arm 912 a by limiting theminimum value of theta S.

The lead screw 840 a, 840 b may be driven by a single motor assembly810. The lead screw 840 a, 840 b is driven by a single motor assembly810, so that the second arm 912 a, 912 b can stand up in symmetry.However, when driving the lead screw 840 a, 840 b by a single motorassembly 810, the load on the motor assembly 810 to stand the second arm912 a, 912 b may be excessively increased. At this time, the third plate875 a may reduce the load on the motor assembly 810 to stand the secondarm 912 a, 912 b, by limiting the minimum value of theta S.

The structure formed by the left lead screw 840 b, the left slider 860b, the left rod 870 b, and the left link 910 b may be symmetric with thestructure formed by the right lead screw 840 a, the right slider 860 a,the right rod 870 a, and the right link 910 a. In this case, the axis ofsymmetry may be the axis of symmetry ys of the motor assembly 810.

Referring to FIG. 47, a guide 850 a, 850 b, 850 c, 850 d may beconnected to the bearing 830 a, 830 b, 830 c, and 830 d. The guide 850a, 850 b, 850 c, 850 d may include a right guide 850 a, 850 b disposedin the right side of the motor assembly 810 and a left guide 850 c, 850d disposed in the left side of the motor assembly 810.

The right guide 850 a, 850 b may have one side connected to a firstright bearing 830 a and the other side connected to a second rightbearing 830 b. The right guide 850 a, 850 b may be located in parallelwith the right lead screw 840 a. Alternatively, the right guide 850 a,850 b may be spaced apart from the right lead screw 840 a.

The right guide 850 a, 850 b may include a first right guide 850 a and asecond right guide 850 b. The first right guide 850 a and the secondright guide 850 b may be spaced apart from each other. The right leadscrew 840 a may be located between the first right guide 850 a and thesecond right guide 850 b.

The right slider 860 a may include a protrusion. Alternatively, thedisplay device may include a protrusion formed in the right slider 860a. The protrusion may be formed in the body of the slider. Theprotrusion may include a front protrusion (not shown) protruded in the+z-axis direction from the body 861 a of the right slider 860 a and arear protrusion 865 a protruded in the −z-axis direction from the bodyof the slider.

The first right guide 850 a may penetrate the rear protrusion 865 a.Alternatively, it may include a first hole 863 a formed in the rearprotrusion, and the first right guide 850 a may penetrate the first hole863 a. The first hole 863 a may be formed in the x-axis direction. Thefirst hole 863 a may be referred to as a hole 863 a.

The second right guide (not shown) may penetrate the front protrusion(not shown). Alternatively, it may include a second hole (not shown)formed in the front protrusion, and the second right guide may penetratethe second hole. The second hole may be formed in the x-axis direction.

The right guide 850 a, 850 b may guide the right slider 860 a to movemore stably when the right slider 860 a moves forward or rearward alongthe right lead screw 840 a. As the right guide 850 a, 850 b stablyguides the right slider 860 a, the right slider 860 a can move forwardor rearward along the right lead screw 840 a while not rotating withrespect to the right lead screw 840 a.

The structure formed by the left guide 850 c, 850 d, the left bearing830 a, 830 b, 830 c, and 830 d, the left slider 860 b, and the left leadscrew 840 b may be symmetrical with the structure formed by the rightguide 850 a, 850 b, the right bearing 830 a, 830 b, 830 c, and 830 d,the right slider 860 a, and the right lead screw 840 a. In this case,the axis of symmetry may be the axis of symmetry ys of the motorassembly 810.

Referring to FIG. 48, a first spring 841 a, 841 b may be inserted intothe lead screw 840 a, 840 b. Alternatively, the lead screw 840 a, 840 bmay penetrate the first spring 841 a, 841 b. The first spring 841 a, 841b may include a first right spring 841 a disposed in the right side ofthe motor assembly 810 and a first left spring 841 b disposed in theleft side of the motor assembly 810.

The first right spring 841 a may be disposed between the right slider860 a and the second right bearing 830 b. One end of the first rightspring 841 a may be in contact with or separated from the right slider860 a. The other end of the first right spring 841 a may be in contactwith or separated from the second right bearing 830 b.

When the second arm 912 a is fully laid with respect to the base 31, thedistance between the right slider 860 a and the second right bearing 830b may be a distance RD3. The first right spring 841 a may have a lengthgreater than the distance RD3 in the state of not being compressed ortensioned. Thus, when the second arm 912 a is fully laid with respect tothe base 31, the first right spring 841 a may be compressed between theright slider 860 a and the second right bearing 830 b. Then, the firstright spring 841 a may provide a restoring force to the right slider 860a in the +x axis direction.

When the second arm 912 a changes from a fully laid state to a standingstate with respect to the base 31, the restoring force provided by thefirst right spring 841 a may assist the second arm 912 a to stand up. Asthe first right spring 841 a assists the second arm 912 a to stand up,the load on the motor assembly 810 may be reduced.

The lead screw 840 a, 840 b may be driven by a single motor assembly810. As the lead screw 840 a, 840 b is driven by a single motor assembly810, the second arm 912 a, 912 b can stand up in symmetry. However, whenthe lead screw 840 a, 840 b is driven by a single motor assembly 810,the load on the motor assembly 810 to stand the second arm 912 a, 912 bmay be excessively increased. At this time, the first right spring 841 aassists the second arm 912 a to stand up, so that the load on the motorassembly 810 can be decreased, and the load on the motor assembly 810 tostand the second arm 912 a can be reduced.

Alternatively, when the second arm 912 a changes from the standing stateto the fully laid state with respect to the base 31, the restoring forceprovided by the first right spring 841 a can alleviate the shock thatoccurs when the second arm 912 a is laid with respect to the base 31.That is, the first right spring 841 a may serve as a damper when thesecond arm 912 a is laid with respect to the base 31. As the first rightspring 841 a serves as a damper, the load of the motor assembly 810 maybe reduced.

The structure formed by the first left spring 841 b, the left bearing830 a, 830 b, 830 c, and 830 d, the left slider 860 b, the left leadscrew 840 b, and the second arm 912 a may be symmetrical with thestructure formed by the first right spring 841 a, the right bearing 830a, 830 b, 830 c, and 830 d, the right slider 860 a, the right lead screw840 a, and the second arm 912 a. In this case, the axis of symmetry maybe the axis of symmetry ys of the motor assembly 810.

Referring to FIG. 49, the second spring 851 a, 851 b may be insertedinto the guide 850 a, 850 b, 850 c, 850 d. Alternatively, the guide 850a, 850 b, 850 c, 850 d may penetrate the second spring 851 a, 851 b. Thesecond spring 851 a, 851 b may include a second right spring 851 adisposed in the right side of the motor assembly 810 and a second leftspring 851 b disposed in the left side of the motor assembly 810.

A plurality of second right springs 851 a may be formed. The secondright spring 851 a may include a spring 940 a, 940 b inserted into thefirst right guide 850 a and a spring 940 a, 940 b inserted into thesecond right guide 850 b. Alternatively, the second right spring 851 amay include a spring 940 a, 940 b through which the first right guide850 a passes and a spring 940 a, 940 b through which the second rightguide 850 b passes.

The guide 850 a, 850 b, 850 c, 850 d may include a locking jaw 852 a,852 b. The locking jaw 852 a, 852 b may include a right locking jaw 852a disposed in the right side of the motor assembly 810 and a leftlocking jaw 852 b disposed in the left side of the motor assembly 810.

The right locking jaw 852 a may be disposed between the right slider 860a and the second right bearing 830 b. The second right spring 851 a maybe disposed between the right slider 860 a and the second right bearing830 b. One end of the second right spring 851 a may be in contact withor separated from the right slider 860 a. The other end of the secondright spring 851 a may be in contact with or separated from the rightlocking jaw 852 a.

When the second arm 912 a is fully laid with respect to the base 31, thedistance between the right slider 860 a and the right locking jaw 852 amay be a distance RD4. The second right spring 851 a may have a lengthgreater than the distance RD4 in the state of being not compressed ortensioned. Thus, when the second arm 912 a is fully laid with respect tothe base 31, the second right spring 851 a may be compressed between theright slider 860 a and the right locking jaw 852 a. The second rightspring 851 a may provide a restoring force to the right slider 860 a inthe +x axis direction.

When the second arm 912 a changes from the fully laid state to thestanding state with respect to the base 31, the restoring force providedby the second right spring 851 a may assist the second arm 912 a tostand up. As the second right spring 851 a assists the second arm 912 ato stand, the load on the motor assembly 810 can be reduced.

The lead screw 840 a, 840 b may be driven by a single motor assembly810. As the lead screw 840 a, 840 b is driven by a single motor assembly810, the second arm 912 a, 912 b may stand up in symmetry. However, whenthe lead screw 840 a, 840 b is driven by a single motor assembly 810,the load on the motor assembly 810 to stand the second arm 912 a, 912 bmay be excessively increased. At this time, the second right spring 851a may assist the second arm 912 a to stand up so that the load on themotor assembly 810 can be decreased, thereby reducing the load on themotor assembly 810 to stand the second arm 912 a.

Alternatively, when the second arm 912 a changes from the standing stateto the fully laid state with respect to the base 31, the restoring forceprovided by the second right spring 851 a can alleviate the shock thatoccurs when the second arm 912 a is laid with respect to the base 31.That is, the second right spring 851 a may serve as a damper when thesecond arm 912 a is laid with respect to the base 31. As the secondright spring 851 a serves as a damper, the load of the motor assembly810 may be reduced.

The structure formed by the second left spring 851 b, the left lockingjaw 852 b, the left slider 860 b, the left guide 850 c, 850 d, and thesecond arm 912 a may be symmetric with the structure formed by theabove-described second right spring 851 a, the right locking jaw 852 a,the right slider 860 a, the right guide 850 a, 850 b, and the second arm912 a. In this case, the axis of symmetry may be the axis of symmetry ysof the motor assembly 810.

Referring to FIGS. 50 to 52, the second arm 912 a may stand up byreceiving a restoring force from the first right spring 841 a and thesecond right spring 851 a.

An angle formed by the second arm 912 a with respect to the base 31 maybe referred to as an angle theta S. The angle formed by the right rod870 a with respect to the base may be referred to as an angle theta T.The force applied by the motor assembly 810 for moving the right slider860 a in the +x-axis direction may be referred to as FA. The forceexerted on the right slider 860 a by the first right spring 841 a may bereferred to as FB. The force exerted on the right slider 860 a by thesecond right spring 851 a may be referred to as FC. The forcetransmitted by the right rod 870 a to the second arm 912 a may bereferred to as FT.

When the second arm 912 a is fully laid with respect to the base 31, theangle theta S and the angle theta T may have minimum values. When thesecond arm 912 a changes from the fully laid state to the standing statewith respect to the second base 31, the angle theta S and the angletheta T may be gradually increased.

When the second arm 912 a is fully laid with respect to the base 31, thefirst right spring 841 a may be compressed. The compressed first rightspring 841 a may provide restoring force FB to the right slider 860 a.The restoring force FB may act in the +x direction. When the second arm912 a is fully laid with respect to the base 31, the compressiondisplacement amount of the first right spring 841 a may be maximized,and the magnitude of the restoring force FB may have a maximum value.When the second arm 912 a changes from the fully laid state to thestanding state with respect to the base 31, the compression displacementamount of the first right spring 841 a may be gradually decreased, andthe magnitude of the restoring force FB may be gradually decreased.

When the second arm 912 a is fully laid with respect to the base 31, thesecond right spring 851 a may be compressed. The compressed second rightspring 851 a may provide restoring force FC to the right slider 860 a.The restoring force FC may act in the +x direction. When the second arm912 a is fully laid with respect to the base 31, the compressiondisplacement amount of the second right spring 851 a may be maximized,and the magnitude of the restoring force FC may have a maximum value.When the second arm 912 a changes from the fully laid state to thestanding state with respect to the base 31, the compression displacementamount of the second right spring 851 a may be gradually decreased, andthe magnitude of the restoring force FC may be gradually decreased.

The force FT that the right rod 870 a transmits to the second arm 912 amay be a summed force of the force FA applied by the motor assembly 810for moving the right slider 860 a in the +x-axis direction, therestoring force FB of the first right spring 841 a, and the restoringforce FC of the second right spring 851 a.

When the second arm 912 a starts to stand up in the state where thesecond arm 912 a is fully laid with respect to the base 31, the load ofthe motor assembly 810 may be maximized. At this time, the magnitude ofthe restoring force FB provided by the first right spring 841 a may bemaximized. In addition, the magnitude of the restoring force FC providedby the second spring 851 a, 851 b may be maximized.

When the second arm 912 a changes from the fully laid state to thestanding state with respect to the base 31, the restoring force providedby the first right spring 841 a and the second right spring 851 a mayassist to stand the second arm 912 a. As the first right spring 841 aand the second right spring 851 a assist the second arm 912 a to stand,the load of the motor assembly 810 can be reduced.

The first right spring 841 a and the second right spring 851 a maysimultaneously provide the restoring force (the summed force of therestoring force FB and the restoring force FC) to the right slider 860a. The restoring force (the summed force of the restoring force FB andthe restoring force FC) may be provided to the right slider 860 a untilthe distance RD5 between the right slider 860 a and the right lockingjaw 852 a becomes equal to the length of the second right spring 851 a.

When the distance RD5 between the right slider 860 a and the rightlocking jaw 852 a is equal to the length of the second right spring 851a, the compression displacement amount of the second right spring 851 amay become zero. When the compression displacement amount of the secondright spring 851 a is zero, the restoring force FC provided by thesecond right spring 851 a to the right slider 860 a may be zero.

When the distance RD5 between the right slider 860 a and the rightlocking jaw 852 a is greater than the length of the second right spring851 a, only the first right spring 841 a may provide the restoring forceFB to the right slider 860 a. The restoring force FB may be provided tothe right slider 860 a until the distance RD6 between the right slider860 a and the second right bearing 830 b becomes equal to the length ofthe first right spring 841 a.

When the distance RD6 between the right slider 860 a and the secondright bearing 830 b is equal to the length of the first right spring 841a, the compression displacement amount of the first right spring 841 amay be zero. When the compression displacement amount of the first rightspring 841 a becomes zero, the restoring force FB provided by the firstright spring 841 a to the right slider 860 a may be zero.

When the distance RD6 between the right slider 860 a and the secondright bearing 830 b is greater than the length of the first right spring841 a, the motor assembly 810 may stand the second arm 912 a withoutreceiving the restoring force from the first right spring 841 a or thesecond right spring 851 a.

The structure formed by the first left spring 841 b, the second leftspring 851 b, the left locking jaw 852 b, the left slider 860 b, theleft guide 850 c, 850 d, the left lead screw 840 b, the left rod 870 b,and the second arm 912 a may be symmetrical with the structure formed bythe first right spring 841 a, the second right spring 851 a, the rightlocking jaw 852 a, the right slider 860 a, the right guide 850 a, 850 b,the right lead screw 840 a, the right rod 870 a, and the second arm 912a. In this case, the axis of symmetry may be the axis of symmetry ys ofthe motor assembly 810.

Referring to FIG. 53, the pusher 930 a, 930 b may be connected to thelink mount 920 a, 920 b. The pusher 930 a, 930 b may include a rightpusher 930 a disposed in the right side of the motor assembly 810 and aleft pusher 930 b disposed in the left side of the motor assembly 810.

The link mount 920 a, 920 b may form an accommodation space A. Theaccommodation space A may accommodate the spring 940 a, 940 b and thepusher 930 a, 930 b. The spring 940 a, 940 b may include a right spring940 a disposed in the right side of the motor assembly 810 and a leftspring 940 b disposed in the left side of the motor assembly 810. Theaccommodation space A may be referred to as an internal space A.

The link mount 920 a, 920 b may include a first hole 922 a connectingthe accommodation space A and an external space (the first holecorresponding to 920 b is not shown). The first hole 922 a may be formedin the upper surface of the link mount 920 a, 920 b. The first hole 922a may be referred to as a hole 922 a.

The pusher 930 a, 930 b may be located perpendicular to the base 31.Alternatively, the pusher 930 a, 930 b may be disposed parallel to the yaxis. The spring 940 a, 940 b may be located perpendicular to the base31. Alternatively, the spring 940 a, 940 b may be disposed parallel tothe y axis.

The pusher 930 a, 930 b may include a first part 931 a, 931 b and asecond part 932 a, 932 b. The second part 932 a, 932 b may be connectedto the lower side of the first part 931 a, 931 b. The lower end of thesecond part 932 a, 932 b may be connected to the spring 940 a, 940 b.All or part of the second part 932 a, 932 b may be accommodated in theaccommodation space A formed by the link mount 920 a, 920 b. The secondpart 932 a, 932 b may have a diameter equal to the diameter of the firsthole 922 a or may have a diameter less than the diameter of the firsthole 922 a. The second part 932 a, 932 b may penetrate the first hole922 a.

The first part 931 a, 931 b may be located outside the link mount 920 a,920 b. Alternatively, the first part 931 a, 931 b may be located outsidethe accommodation space A of the link mount 920 a, 920 b. The first part931 a, 931 b may have a diameter greater than the diameter of the firsthole 922 a.

The first part 931 a, 931 b may be in contact with or spaced apart fromthe link bracket 951 a, 951 b. For example, when the second arm 912 a,912 b is fully laid with respect to the base 31, the first part 931 a,931 b may be in contact with the link bracket 951 a, 951 b.Alternatively, when the second arm 912 a, 912 b fully stands up withrespect to the base 31, the first part 931 a, 931 b may be spaced apartfrom the link bracket 951 a, 951 b.

When the first part 931 a, 931 b is in contact with the link bracket 951a, 951 b, the pusher 930 a, 930 b may receive a force from the linkbracket 951 a, 951 b. The force applied to the pusher 930 a, 930 b maybe in a downward direction. Alternatively, the force applied to thepusher 930 a, 930 b may be in the −y axis direction. Alternatively, thelink bracket 951 a, 951 b may press the pusher 930 a, 930 b. Thedirection in which the link bracket 951 a, 951 b presses the pusher 930a, 930 b may be downward. Alternatively, the direction in which the linkbracket 951 a, 951 b presses the pusher 930 a, 930 b may be in the −yaxis direction.

When the first part 931 a, 931 b is applied with a force, the spring 940a, 940 b may be compressed. The compressed spring 940 a, 940 b mayprovide restoring force to the pusher 930 a, 930 b. The direction of therestoring force may be opposite to the direction of the force applied tothe first part 931 a, 931 b. Alternatively, the restoring force may actin the +y-axis direction.

The link mount 920 a, 920 b may include a second hole 921 a (the secondhole corresponding to 920 b is not shown). The second hole 921 a mayconnect the accommodation space A and the external space. All or part ofthe spring 940 a, 940 b may be exposed to the outside through the secondhole 921 a. All or part of the pusher 930 a, 930 b may be exposed to theoutside through the second hole 921 a. In the maintenance or repair ofthe display device, a service provider may check the operating state ofthe pusher 930 a, 930 b through the second hole 921 a. The second hole921 a may provide a service provider with convenience of maintenance orrepair.

Referring to FIGS. 54 to 56, the right link 910 a may stand up byreceiving the restoring force from the right pusher 930 a. It will bedescribed based on the right link 910 a.

An angle formed by the second arm 912 a with respect to the base 31 maybe referred to as an angle theta S. The force transmitted by the rightrod 870 a to the second arm 912 a may be referred to as FT. The forcetransmitted by the right pusher 930 a to the right link bracket 951 amay be referred to as FP.

Referring to FIG. 54, when the second arm 912 a is fully laid withrespect to the base 31, the angle theta S may have a minimum value. Theright spring 940 a connected to the right pusher 930 a may be compressedmaximally, and the magnitude of the restoring force FP may have amaximum value. The compressed right spring 940 a may provide restoringforce FP to the right pusher 930 a. The right pusher 930 a may transmitthe restoring force FP to the right link bracket 951 a. The restoringforce FP can act in the +y-axis direction.

If the second arm 912 a is fully laid with respect to the base 31, thedistance HL from the base 31 to the upper end of the right pusher 930 amay have a minimum value. The first part 931 a of the right pusher 930 amay protrude to the outside of the right link mount 920 a, and thesecond part 932 a of the right pusher 930 a may be fully accommodated inthe accommodation space 923 a of the right link mount 920 a.

Referring to FIG. 55, when the second arm 912 a changes from the fullylaid state to the standing state with respect to the base 31, the angletheta S may gradually increase. The compression displacement amount ofthe right spring 940 a may gradually decrease, and the magnitude of therestoring force FP may gradually decrease.

As the angle theta S gradually increases, at least a part of the secondpart 932 a of the right pusher 930 a may protrude to the outside of theright link mount 920 a. The length by which the second part 932 a of theright pusher 930 a protrudes to the outside of the right link mount 920a may be referred to as a length HP. The distance HL from the base 31 tothe upper end of the right pusher 930 a may increase by HP than a casewhere the second arm 912 a is fully laid with respect to the base 31.

Referring to FIG. 56, when the second arm 912 a stands up with respectto the base 31, the right pusher 930 a and the right link bracket 951 amay be separated from each other. The compression displacement amount ofthe right spring 940 a may be zero. When the compression displacementamount of the right spring 940 a becomes zero, the restoring force FPprovided by the right pusher 930 a to the right link bracket 951 a maybe zero.

In addition, the length HP by which the second part 932 a of the rightpusher 930 a protrudes to the outside of the right link mount 920 a mayhave a maximum value. The distance HL from the base 31 to the upper endof the right pusher 930 a may have a maximum value.

That is, the right pusher 930 a may assist the second arm 912 a to standand reduce the load of the motor assembly 810 by applying a restoringforce to the right link bracket 951 a, while the right pusher 930 a andthe right link bracket 951 a are in contact with each other.

The lead screw 840 a, 840 b may be driven by a single motor assembly810. As the lead screw 840 a, 840 b is driven by a single motor assembly810, the second arm 912 a, 912 b can stand up in symmetry. However, whenthe lead screw 840 a, 840 b is driven by a single motor assembly 810,the load on the motor assembly 810 to stand the second arm 912 a, 912 bmay be excessively increased. At this time, the right pusher 930 a mayapply the restoring force to the right link bracket 951 a, therebyassisting the second arm 912 a to stand up and reducing the load of themotor assembly 810.

Alternatively, when the second arm 912 a changes from the standing stateto the fully laid state with respect to the base 31, the restoring forcethat the right pusher 930 a provides to the right link bracket 951 a canalleviate the shock that occurs when the link 910 a is laid with respectto the base 31. That is, the restoring force provided by the rightpusher 930 a to the right link bracket 951 a may serve as a damper whenthe link 910 a is laid with respect to the base 31. As the right pusher930 a serves as a damper, the load of the motor assembly 810 may bereduced.

The structure formed by the left pusher 930 b, the left spring 940 b,the left link bracket 951 b, the left link mount 920 b, and the left rod870 b may be symmetric with the structure formed by the right pusher 930a, the right spring 940 a, the right link bracket 951 a, the right link910 a mount, and the right rod 870 a. In this case, the axis of symmetrymay be the axis of symmetry of the motor assembly 810.

Referring to FIGS. 57 to 59, the panel roller 143 may be installed inthe base 31. The panel roller 143 may be installed in front of the leadscrew 840 a, 840 b. Alternatively, the panel roller 143 may be disposedin parallel with the length direction of the lead screw 840 a, 840 b.Alternatively, the panel roller 143 may be spaced apart from the leadscrew 840 a, 840 b.

The display unit 20 may include a display panel 10 and a module cover15. The lower side of the display unit 20 may be connected to the panelroller 143, and the upper side of the display unit 20 may be connectedto the upper bar 75. The display unit 20 may be wound around or unwoundfrom the panel roller 143.

The distance from the axis of symmetry ys of the motor assembly 810 tothe right slider 860 a may be referred to as a distance RD. The distancefrom the axis of symmetry ys of the motor assembly 810 to the leftslider 860 b may be referred to as a distance LD. The distance betweenthe right slider 860 a and the left slider 860 b may be referred to as adistance SD. The distance SD may be the sum of the distance RD and thedistance LD. The distance from the base 31 to the upper end of thedisplay unit 20 may be referred to as a distance HD.

Referring to FIG. 57, when the second arm 912 a, 912 b is fully laidwith respect to the base 31, the distance SD between the right slider860 a and the left slider 860 b may have a minimum value. The distanceRD from the axis of symmetry ys of the motor assembly 810 to the rightslider 860 a may be the same as the distance LD from the axis ofsymmetry ys of the motor assembly 810 to the left slider 860 b.

When the second arm 912 a, 912 b is fully laid with respect to the base31, the distance HD from the base 31 to the upper end of the displayunit 20 may have a minimum value.

When the second arm 912 a, 912 b is fully laid with respect to the base31, the first spring 841 a, 841 b may contact the slider 860 a, 860 b.In addition, the second spring 851 a, 851 b may contact the slider 860a, 860 b. In addition, the pusher 930 a, 930 b may contact the linkbracket 951 a, 951 b.

When the second arm 912 a, 912 b is fully laid with respect to the base31, the amount of compression of the first spring 841 a, 841 b may havea maximum value, and the magnitude of the restoring force provided tothe slider 860 a, 860 b by the first spring 841 a, 841 b may have amaximum value.

When the second arm 912 a, 912 b is fully laid with respect to the base31, the amount of compression of the second spring 851 a, 851 b may havea maximum value, and the magnitude of the restoring force provided tothe slider 860 a, 860 b by the second spring 851 a, 851 b may have amaximum value.

When the second arm 912 a, 912 b is fully laid with respect to the base31, the amount of compression of the spring 940 a, 940 b may have amaximum value, and the magnitude of the restoring force provided to thepusher 930 a, 930 b by the spring 940 a, 940 b may have a maximum value.

When the second arm 912 a, 912 b start to stand with respect to the base31, the second arm 912 a, 912 b may stand by receiving a restoring forcefrom the first spring 841 a, 841 b, the second spring 851 a, 851 b, andthe spring 940 a, 940 b. Thus, the load on the motor assembly 810 may bereduced.

Referring to FIG. 58, as the second arm 912 a, 912 b stands with respectto the base 31, the distance SD between the right slider 860 a and theleft slider 860 b may gradually increase. Even if the distance SDincreases, the distance LD and the distance RD may be equal to eachother. That is, the right slider 860 a and the left slider 860 b may besymmetrically located with respect to the axis of symmetry ys of themotor assembly 810. In addition, the extent to which the second arm 912a, 912 b of the right link 910 a stands with respect to the base 31 andmay be equal to the extent to which the second arm 912 a, 912 b of theleft link 910 b stands with respect to the base 31.

As the second arm 912 a, 912 b stands with respect to the base 31, thedistance HD from the base 31 to the upper end of the display unit 20 maygradually increase. The display unit 20 may be unwound from the panelroller 143. Alternatively, the display unit 20 may be unfolded from thepanel roller 143.

When the second arm 912 a, 912 b fully stands up with respect to thebase 31, the first spring 841 a, 841 b may be separated from the slider860 a, 860 b. In addition, when the second arm 912 a, 912 b fully standsup with respect to the base 31, the second spring 851 a, 851 b may beseparated from the slider 860 a, 860 b. In addition, when the second arm912 a, 912 b stands up with respect to the base 31, the pusher 930 a,930 b may be separated from the link bracket 951 a, 951 b.

The separation of the first spring 841 a, 841 b from the slider 860 a,860 b, the separation of the second spring 851 a, 851 b from the slider860 a, 860 b, and the separation of the pusher 930 a, 930 b from thelink bracket 951 a, 951 b may proceed independently of each other. Thatis, the order of the separation of the first spring 841 a, 841 b fromthe slider 860 a, 860 b, the separation of the second spring 851 a, 851b from the slider 860 a, 860 b, and the separation of the pusher 930 a,930 b from the link bracket 951 a, 951 b may be mutually variable.

The angle formed between the axis xs1 parallel to the base 31 and thesecond arm 912 a may be referred to as theta R. The angle formed betweenthe axis xs1 parallel to the base 31 and the first arm 911 a may bereferred to as theta R′. The axis xs1 and x-axis may be parallel.

When the second arm 912 a is fully laid with respect to the base 31, orwhile the second arm 912 a stands up with respect to the base 31, orwhen the standing of the second arm 912 a with respect to the base 31 iscompleted, theta R and theta R′ can be maintained to be the same.

The angle formed between the axis xs2 parallel to the base 31 and thesecond arm 912 b may be referred to as theta L. The angle formed betweenthe axis xs2 parallel to the base 31 and the first arm 911 b may bereferred to as theta L′. The axis xs2 and x-axis may be parallel.

When the second arm 912 b is fully laid with respect to the base 31, orwhile the second arm 912 b stands up with respect to the base 31, orwhen the standing of the second arm 912 a with respect to the base 31 iscompleted, theta L and theta L′ can be maintained to be the same.

The axis xs1 and the axis xs2 may be the same axis mutually.

Referring to FIG. 59, when the second arm 912 a, 912 b fully stands upwith respect to the base 31, the distance SD between the right slider860 a and the left slider 860 b may have a maximum value. Even when thedistance SD is maximized, the distance LD and the distance RD may beequal to each other.

When the second arm 912 a, 912 b fully stands up with respect to thebase 31, the distance HD from the base 31 to the upper end of thedisplay unit 20 may have a maximum value.

Referring to FIGS. 60 and 61, the module cover 15 may be coupled to therear surface of the display panel 10. The module cover 15 may include aplurality of segments 15 b, 15 d, and 15 e extending long in theleftward-rightward direction of the display panel 10. The plurality ofsegments 15 b, 15 d, and 15 e may be sequentially fixed to the rearsurface of the display panel 10 in the upward-downward direction of thedisplay panel 10.

An extension sheet 11 may extend from the lower side of the displaypanel 10. The extension sheet 11 may have a width corresponding to thelength of the lower side of the display panel 10, and may have a lengthsufficient to be wound around the panel roller 143.

Referring to FIG. 62, the lower end of the extension sheet 11 may befixed to one side of the panel roller 143. The upper end of theextension sheet 11 may be connected to the display panel 10. As thepanel roller 143 is rotated, the extension sheet 11 may be wound aroundthe panel roller. For example, the number of revolutions that theextension sheet 11 is wound around the panel roller 143 may be onerevolution or less.

As the extension sheet 11 is wound around the panel roller 143, thedisplay panel 10 and the module cover 15 may be wound around the panelroller 143. When the extension sheet 11 is wound around the panel roller143, the module cover 15 may be wound earlier around the panel roller143 than the display panel 10, and then the display panel 10 and themodule cover 15 may be wound around the panel roller 143 together. Thatis, the module cover 15 may cover a portion of the rear surface of theextension sheet 11 and the rear surface of the display panel 10.

For example, the display panel 10 and the extension sheet 11 may bewound around the panel roller 143 by 2.5 to 2.7 revolutions. At thistime, the display panel 10 may be wound around the panel roller 143 byabout 2.2 revolutions.

Referring to FIG. 63, as the display panel 10 and the module cover 15are wound around the panel roller 143 by one revolution or more, therear surface of the module cover 15 may overlap the front surface of thedisplay panel 10. At this time, as the display panel 10 and the modulecover 15 are wound around the display panel 10 and the module cover 15wound around the panel roller 143 by one revolution in an overlappingstate, the display panel 10 starting to be wound by two revolutions maybe bent or folded due to the thickness of the display panel 10 and/orthe module cover 15. In addition, vibration and noise may be generatedas the panel roller 143 is rotated.

Referring to FIG. 64, the module cover 15 may be coupled to the rearsurface of the display panel 10. The S-PCB 120 may be located adjacentto the upper side of the display panel 10. The S-PCB 120 may beelectrically connected to the display panel 10 via a chip on film (COF)121. The FFC cable 231 may extend from the S-PCB 120 toward the lowerend of the display panel 10 through the module cover 15 so as to beelectrically connected to the T-con board 105 (see FIGS. 13 to 15).

Shock-absorbing members 16A and 16B may be disposed on the extensionsheet 11. The shock-absorbing members 16A and 16B may be referred to asgap fillers. The shock-absorbing members 16A and 16B may extend long inthe leftward-rightward direction of the display panel 10, and aplurality of shock-absorbing members 16A and 16B may be sequentiallydisposed in the upward-downward direction of the display panel 10. Forexample, each of the shock-absorbing members 16A and 16B may be spongeor reinforced sponge. A first plurality of shock-absorbing members 16Amay be disposed between the right side of the display panel 10 and theFFC cable 231. In addition, a second plurality of shock-absorbingmembers 16B may be disposed between the left side of the display panel10 and the FFC cable 231.

For example, each of the shock-absorbing members 16A and 16B may be madeof polyurethane, may have a length of 200 mm, a width of 10 mm, and athickness of 6 mm. As another example, the number of shock-absorbingmembers 16A may be 8, and the number of shock-absorbing members 16B maybe 8.

Referring to FIGS. 65 and 66, the module cover 15 may be coupled to therear surface of the display panel 10. The module cover 15 may include aplurality of segments 15 b, 15 d, and 15 e extending long in theleftward-rightward direction of the display panel 10. The plurality ofsegments 15 b, 15 d, and 15 e may be sequentially fixed to the rearsurface of the display panel 10 in the upward-downward direction of thedisplay panel 10.

The extension sheet 11 may extend from the lower side of the displaypanel 10. The extension sheet 11 may have a width corresponding to thelength of the lower side of the display panel 10, and may have a lengthsufficient to be wound around the panel roller 143.

The shock-absorbing members 16A and 16B may be symmetrical with respectto the FFC cable 231 on the extension sheet 11. The first plurality ofshock-absorbing members 16A may be fixed to the extension sheet 11 atthe right side of the display panel 10 with respect to the FFC cable231. The second plurality of shock-absorbing members 16B may be fixed tothe extension sheet 11 at the left side of the display panel 10 withrespect to the FFC cable 231.

The shock-absorbing members 16A and 16B may not be distinguished inexternal appearance from the module cover 15. The shock-absorbingmembers 16A and 16B may have the same shape as the module cover 15, andmay be made of a different material than the module cover 15. Forexample, the module cover 15 may be made of aluminum or steel, and theshock-absorbing members 16A and 16B may be made of sponge. As theextension sheet 11 is wound around the panel roller 143, theshock-absorbing members 16A and 16B may also be wound around the panelroller 143. When the shock-absorbing members 16A and 16B are woundaround the panel roller 143, the distance between the shock-absorbingmembers may increase due to curvature of the panel roller 143.

Referring to FIG. 67, the module cover 15 may be fixed to the rearsurface of the display panel 10 via an adhesive member 70. The extensionsheet 11 may extend from the lower side of the display panel 10. Theextension sheet 11 may be coupled or connected to the display panel 10via an adhesive sheet 77. The adhesive sheet 77 may be the same as theadhesive member 70.

The shock-absorbing members 16A may be fixed to the adhesive sheet 77,or may be fixed to the rear surface of the extension sheet 11. Forexample, the shock-absorbing members 16A may located adjacent to thelower end of the module cover 15, and may be sequentially disposed onthe adhesive sheet 77 and the extension sheet 11 in the upward-downwarddirection of the display panel 10. A first shock-absorbing member 16 amay be fixed to the adhesive sheet 77 in the state of being adjacent tothe lower end of the module cover 15. A second shock-absorbing member 16b may be fixed to the adhesive sheet 77 in the state of neighboring thefirst shock-absorbing member 16 a. A third shock-absorbing member 16 cmay be fixed to the adhesive sheet 77 in the state of neighboring thesecond shock-absorbing member 16 b. A fourth shock-absorbing member 16 dmay be fixed to the adhesive sheet 77 and/or the extension sheet 11 inthe state of neighboring the third shock-absorbing member 16 c. At thistime, the fourth shock-absorbing member 16 d may have adhesive force.

A fifth shock-absorbing member 16 e may be fixed to the extension sheet11 in the state of neighboring the fourth shock-absorbing member 16 d. Asixth shock-absorbing member 16 f may be fixed to the extension sheet 11in the state of neighboring the fifth shock-absorbing member 16 e. Aseventh shock-absorbing member 16 g may be fixed to the extension sheet11 in the state of neighboring the sixth shock-absorbing member 16 f. Atthis time, the fifth shock-absorbing member 16 e to an eighthshock-absorbing member 16 h (see FIG. 64) may have adhesive force.

The distance between the respective shock-absorbing members 16A may besubstantially equal to or greater than the distance between therespective segments of the module cover 15. The distance between thefirst shock-absorbing member 16 a, the second shock-absorbing member 16b, the third shock-absorbing member 16 c, and/or the fourthshock-absorbing member 16 d may be greater than the distance between therespective segments of the module cover 15. The distance between thefifth shock-absorbing member 16 e, the sixth shock-absorbing member 16f, and/or the seventh shock-absorbing member 16 g may be greater thanthe distance between the first shock-absorbing member 16 a, the secondshock-absorbing member 16 b, the third shock-absorbing member 16 c,and/or the fourth shock-absorbing member 16 d. Consequently, it ispossible to prevent bending that may be formed as the extension sheet 11and the shock-absorbing members 16A are wound around the panel roller143.

Referring to FIG. 68, the extension sheet 11 (see FIG. 66) and theshock-absorbing members 16A are wound around the panel roller 143, andthen the display module 10 and the module cover 15 are wound around thepanel roller 143. As a result, the display module 10 and the modulecover 15 overlap the extension sheet 11 and the shock-absorbing members16A, whereby the shock-absorbing members 16A fixed to the extensionsheet 11 may be compressed and thus form a gentle gradient.

Compression of the shock-absorbing members 16A may be performed withrespect to the display panel 10 and the module cover 15 in the order ofthe eighth shock-absorbing member 16 h, the seventh shock-absorbingmember 16 g, and the sixth shock-absorbing member 16 f. At this time,the height of the compressed seventh shock-absorbing member 16 g may begreater than the height of the compressed eighth shock-absorbing member16 h, and the height of the compressed sixth shock-absorbing member 16 fmay be greater than the height of the compressed seventh shock-absorbingmember 16 g. In addition, the height of the compressed fifthshock-absorbing member 16 e may be greater than the height of thecompressed sixth shock-absorbing member 16 f, and the height of thecompressed fourth shock-absorbing member 16 d may be greater than theheight of the compressed fifth shock-absorbing member 16 e. The heightof the first shock-absorbing member 16 a may be substantially equal tothe thickness of the module cover 15.

Consequently, the shock-absorbing members 16A form a continuous gentlegradient, whereby it is possible to prevent bending of the display panelthat may occur as the display panel 10 and the module cover 15 are woundby one revolution or more on the basis of the distal end of the modulecover 15 and to eliminate vibration and noise due to rotation of thepanel roller 143.

In accordance with an aspect of the present disclosure, provided is adisplay device including a display panel configured to be wound aroundor unwound from a roller installed in a housing, wherein the housing isconfigured to provide a receiving space for the display panel, a modulecover coupled to a rear of the display panel, wherein the module coveris configured to be wound around or unwound from the roller with thedisplay panel, an extension sheet extending from a lower side of thedisplay panel, wherein the extension sheet is configured to be woundfrom the roller, and at least one shock-absorbing member positioned nextto a lower end of the module cover, wherein the at least oneshock-absorbing member is disposed at a rear surface of the extensionsheet.

In accordance with another aspect of the present disclosure, the modulecover may include a plurality of segments extending in a longitudinaldirection with respect to the housing, wherein the plurality of segmentsmay be arranged at the rear of the display panel along a verticaldirection with respect to the display panel, and wherein the displaydevice may further include a foldable link located at the rear of thedisplay panel, wherein one side of the foldable link may be pivotablycoupled to the housing and another side of the foldable link may bepivotably coupled to an upper portion of the module cover such that thefoldable link may be configured to extend the display panel and themodule cover when unwinding the display panel and the module cover fromthe roller, and the at least one shock-absorbing member may be locatedadjacent to a segment of the module cover from among the plurality ofsegments of the module cover, wherein the segment may be located at thelower end of the module cover.

In accordance with another aspect of the present disclosure, the displaydevice may further include a cable located at the rear of the displaypanel, wherein the cable extends from an upper side of the display panelto a lower side of the display panel, and wherein the at least oneshock-absorbing member may include a first plurality of shock-absorbingmembers fixed to the extension sheet such that the first plurality ofshock-absorbing members may be disposed at a right side of the displaypanel with respect to the cable, and a second plurality ofshock-absorbing members fixed to the extension sheet such that thesecond plurality of shock-absorbing members may be disposed at a leftside of the display panel with respect to the cable.

In accordance with another aspect of the present disclosure, the displaydevice may further include an adhesive sheet fixed to rear surfaces ofthe display panel and the extension sheet, wherein at least one of thefirst plurality of shock-absorbing members may be fixed to the adhesivesheet.

In accordance with another aspect of the present disclosure, a distancebetween each of the first plurality of shock-absorbing members fixed tothe adhesive sheet may be greater than a distance between each of theplurality of segments of the module cover.

In accordance with another aspect of the present disclosure, a distancebetween each of the first plurality of shock-absorbing members fixed tothe extension sheet may be greater than a distance between each of thefirst plurality of shock-absorbing members fixed to the adhesive sheet.

In accordance with another aspect of the present disclosure, the atleast one shock-absorbing member include a first shock-absorbing memberfixed to the extension sheet such that the first shock-absorbing membermay be located adjacent to a segment of the module cover among aplurality of segments of the module cover, wherein the segment may belocated at a lower end of the module cover, and a second shock-absorbingmember fixed to the extension sheet such that the second shock-absorbingmember may be located adjacent to the first shock-absorbing member, andwherein a height of the first shock-absorbing member may be greater thana height of the second shock-absorbing member.

In accordance with another aspect of the present disclosure, the heightof the first shock-absorbing member may correspond to a height of asegment of the module cover at a low end that neighbors the firstshock-absorbing member.

In accordance with another aspect of the present disclosure, the atleast one shock-absorbing member may further include a thirdshock-absorbing member fixed to the extension sheet such that the thirdshock-absorbing member may be located adjacent to the secondshock-absorbing member, wherein a height of the third shock-absorbingmember may be less than the height of the second shock-absorbing member,and an upper surface of the third shock-absorbing member may be inclinedrelative to a lower surface of the third shock-absorbing member.

In accordance with another aspect of the present disclosure, the cablemay extend through at least one of the plurality of segments of themodule cover.

In accordance with another aspect of the present disclosure, the cablemay be inserted into the roller.

As is apparent from the above description, a display device according tothe present disclosure has the following effects.

According to at least one of the embodiments of the present disclosure,it is possible to prevent damage to a display panel generated when thedisplay panel is wound around a roller.

According to at least one of the embodiments of the present disclosure,it is possible to eliminate vibration and noise generated when thedisplay panel is wound around the roller.

The additional scope of applicability of the present disclosure will beapparent from the above detailed description. However, those skilled inthe art will appreciate that various modifications and alterations arepossible, without departing from the idea and scope of the presentdisclosure, and therefore it should be understood that the detaileddescription and specific embodiments, such as the preferred embodimentsof the present disclosure, are provided only for illustration.

Certain embodiments or other embodiments of the disclosure describedabove are not mutually exclusive or distinct from each other. Any or allelements of the embodiments of the disclosure described above may becombined or combined with each other in configuration or function.

For example, a configuration “A” described in one embodiment of thedisclosure and the drawings and a configuration “B” described in anotherembodiment of the disclosure and the drawings may be combined with eachother. Namely, although the combination between the configurations isnot directly described, the combination is possible except in the casewhere it is described that the combination is impossible.

Although embodiments have been described with reference to a number ofillustrative embodiments thereof, it should be understood that numerousother modifications and embodiments can be devised by those skilled inthe art that will fall within the scope of the principles of thisdisclosure. More particularly, various variations and modifications arepossible in the component parts and/or arrangements of the subjectcombination arrangement within the scope of the disclosure, the drawingsand the appended claims. In addition to variations and modifications inthe component parts and/or arrangements, alternative uses will also beapparent to those skilled in the art.

What is claimed is:
 1. A display device comprising: a display panelconfigured to be wound around or unwound from a roller installed in ahousing, wherein the housing is configured to provide a receiving spacefor the display panel; a module cover coupled to a rear of the displaypanel, wherein the module cover is configured to be wound around orunwound from the roller with the display panel; an extension sheetextending from one side of the display panel; and at least oneshock-absorbing member positioned adjacent to the one side of thedisplay panel.
 2. The display device according to claim 1, wherein theat least one shock-absorbing member is disposed at a rear surface of theextension sheet, and wherein the extension sheet is configured to bewound around or unwound from the roller.
 3. The display device accordingto claim 2, wherein the extension sheet is configured to be wound aroundthe roller before the display panel.
 4. The display device according toclaim 2, wherein the one side of the display panel is a lower side ofthe display panel, and wherein the at least one shock-absorbing memberis positioned next to a lower end of the module cover.
 5. The displaydevice according to claim 1, wherein the module cover comprises aplurality of segments extending in a longitudinal direction with respectto the housing, wherein the plurality of segments are arranged at therear of the display panel along a vertical direction with respect to thedisplay panel, and wherein the display device further comprises afoldable link located at the rear of the display panel, wherein one sideof the foldable link is pivotably coupled to the housing and anotherside of the foldable link is pivotably coupled to an upper portion ofthe module cover such that the foldable link is configured to extend thedisplay panel and the module cover when unwinding the display panel andthe module cover from the roller, and the at least one shock-absorbingmember is located adjacent to a segment of the module cover from amongthe plurality of segments of the module cover, wherein the segment islocated at the lower end of the module cover.
 6. The display deviceaccording to claim 5, further comprising a cable located at the rear ofthe display panel, wherein the cable extends from an upper side of thedisplay panel to a lower side of the display panel, and wherein the atleast one shock-absorbing member comprises: a first plurality ofshock-absorbing members fixed to the extension sheet such that the firstplurality of shock-absorbing members is disposed at a right side of thedisplay panel with respect to the cable; and a second plurality ofshock-absorbing members fixed to the extension sheet such that thesecond plurality of shock-absorbing members is disposed at a left sideof the display panel with respect to the cable.
 7. The display deviceaccording to claim 6, further comprising an adhesive sheet fixed to rearsurfaces of the display panel and the extension sheet, wherein at leastone of the first plurality of shock-absorbing members is fixed to theadhesive sheet.
 8. The display device according to claim 7, wherein adistance between each of the first plurality of shock-absorbing membersfixed to the adhesive sheet is greater than a distance between each ofthe plurality of segments of the module cover.
 9. The display deviceaccording to claim 8, wherein a distance between each of the firstplurality of shock-absorbing members fixed to the extension sheet isgreater than a distance between each of the first plurality ofshock-absorbing members fixed to the adhesive sheet.
 10. The displaydevice according to claim 1, wherein the at least one shock-absorbingmember comprises: a first shock-absorbing member fixed to the extensionsheet such that the first shock-absorbing member is located adjacent toa segment of the module cover among a plurality of segments of themodule cover, wherein the segment is located at a lower end of themodule cover; and a second shock-absorbing member fixed to the extensionsheet such that the second shock-absorbing member is located adjacent tothe first shock-absorbing member, and wherein a height of the firstshock-absorbing member is greater than a height of the secondshock-absorbing member.
 11. The display device according to claim 10,wherein the height of the first shock-absorbing member corresponds to aheight of a segment of the module cover at a low end that neighbors thefirst shock-absorbing member.
 12. The display device according to claim11, wherein the at least one shock-absorbing member further comprises athird shock-absorbing member fixed to the extension sheet such that thethird shock-absorbing member is located adjacent to the secondshock-absorbing member, wherein a height of the third shock-absorbingmember is less than the height of the second shock-absorbing member, andan upper surface of the third shock-absorbing member is inclinedrelative to a lower surface of the third shock-absorbing member.
 13. Thedisplay device according to claim 6, wherein the cable extends throughat least one of the plurality of segments of the module cover.
 14. Thedisplay device according to claim 13, wherein the cable is inserted intothe roller.